Corrosion resistance

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Description

The ability of a metal to resist chemical changes due to oxidation. Corrosion resistance can be increased by coating the metal surface with Oil, Wax, Paint, Oxide layers, passive films, a more noble metal (plating), anti-corrosion treatments, or by controlling its exposure environment.

Some materials that can be used to inhibit Corrosion include:

Some anticorrosion treatments include:

For corrosion resistance on metals Process Substrates Advantages Disadvantages
Anodizing Formation of protective oxide layer; immersion in electrolytic solution Non-ferrous metals, primarily aluminum Long-lasting, chemically stable,, non-toxic, no dangerous by-products Unsuitable for ferrous metals; limited options for colors
Galvanizing Immersion of metal in molten zinc bath to produce protective zinc carbonate layer Steel, bolts and nuts, air ducts, trash cans Highly stable, adheres tightly; zinc coating actively covers scratches, cuts and dents after they occur Expensive for large items; color is dull gray
Electroplating (electrodeposition) Deposition of a thin layer of one metal on the surface of another; both metal are placed in electrolytic solution Copper, nickel, gold, silver, chrome, zinc tin, jewelry, ornaments; Excellent corrosion resistance; often increases in mechanical properties, can produce aesthetic appearance Expensive; produces non-uniform coating thicknesses; potentially toxic; solutions contain environmentally harmful chemicals
Powder Coating An electrostatic process to adhere powder-based substance onto a charged metal surface followed by heat curing. Metals, household appliances, automobile parts Coatings are durable with many color options; no solvents are used thus no VOCs emissions Requires spray booths and ovens, difficult to achieve thin coatings
Paint Coating Application of liquid paint; some types of polymers require mixing prior to application Almost anything Readily accessible; cost effective; wide variety of options Some paints contain toxic elements and/or VOCs.; durability is lower than other coatings

Synonyms and Related Terms

Korrosionbestândigkeit (Deut.); résistance à la corrosion (Fr.); corrosion inhibitor

Resources and Citations